Which one of the following is a bio indicator of air pollution ?

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Q: 76 (UPPSC/2013)

Which one of the following is a bio indicator of air pollution ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,83,14,8,83,3,3

keywords: 

{'air pollution': [5, 0, 0, 3], 'fern': [2, 0, 0, 4], 'lichen': [1, 0, 0, 0], 'bio indicator': [0, 0, 0, 1], 'money plant': [0, 0, 0, 1]}